Naturalness in Cosmological Initial Conditions

Details Naturalness in Cosmological Initial Conditions Naturalness in Cosmological Initial Conditions

2005-03-31

arxiv.org/abs/hep-th/0503247v1

Phys.Rev. D72 (2005) 063503

Physics

High Energy Physics

High Energy Physics - Theory

35 pages, 8 figures

Scientific paper

10.1103/PhysRevD.72.063503

We propose a novel approach to the problem of constraining cosmological initial conditions. Within the framework of effective field theory, we classify initial conditions in terms of boundary terms added to the effective action describing the cosmological evolution below Planckian energies. These boundary terms can be thought of as spacelike branes which may support extra instantaneous degrees of freedom and extra operators. Interactions and renormalization of these boundary terms allow us to apply to the boundary terms the field-theoretical requirement of naturalness, i.e. stability under radiative corrections. We apply this requirement to slow-roll inflation with non-adiabatic initial conditions, and to cyclic cosmology. This allows us to define in a precise sense when some of these models are fine-tuned. We also describe how to parametrize in a model-independent way non-Gaussian initial conditions; we show that in some cases they are both potentially observable and pass our naturalness requirement.

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